Lithium battery BMS and charger mutual recognition detection circuit

Abstract

The utility model provides a lithium battery BMS and charger mutual recognition detection circuit, which belongs to the technical field of charging, and comprises a charger, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, an MOS tube M1 and an MOS tube M2, one end of the resistor R1 is connected with the resistor R2 and the resistor R3, the other end of the resistor R1 is connected with a charging interface B +, the other end of the resistor R2 is connected with the resistor R7 and an interface cnct, and the other end of the resistor R2 is connected with the interface cnct. According to the utility model, the mutual recognition circuit of the lithium battery BMS and the charger is added, so that the possibility of fire hazard caused by battery damage due to the fact that the charger is not matched with the lithium battery BMS is inserted is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of charging, in particular to a mutual recognition detection circuit between a lithium battery BMS and a charger. Background Art

[0002] When the current lithium battery needs to be charged, there is no mutual recognition function between it and the charger. Both the lithium battery BMS and the charger port are normally open, and the charger can be directly inserted to charge the lithium battery.

[0003] Although the current mode that does not require mutual recognition between the lithium battery BMS and the charger can charge the lithium battery, it has no safety at all. Once an incompatible charger is inserted, it is very likely to damage the battery and cause a fire. Summary of the Utility Model

[0004] In order to make up for the deficiencies of the prior art, the embodiments of the present application provide a mutual recognition detection circuit between a lithium battery BMS and a charger, and solve the problems in the prior art.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A mutual recognition detection circuit between a lithium battery BMS and a charger includes a charger, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, MOS transistor M1 and MOS transistor M2. One end of resistor R1 is connected to resistor R2 and resistor R3, the other end of resistor R1 is connected to charging interface B+, the other end of resistor R2 is connected to resistor R7 and interface cnct, the other end of resistor R3 is connected to the drain of MOS transistor M1, the source of MOS transistor M1 is connected to resistor R4 and resistor R6, the other end of resistor R6 is connected to the drain of MOS transistor M2 and charging interface B-, the source of MOS transistor M2 is connected to resistor R7 and interface C-, the charger is respectively connected to charging interface B+1, resistor R5 and interface C-1, the gates of MOS transistor M1 and MOS transistor M2 are both connected to the MCU, and the other end of resistor R4 is connected to the MCU.

[0007] As a further technical solution of the utility model: The MOS transistor M1 is a PMOS transistor.

[0008] As a further technical solution of the utility model: The MOS transistor M2 is a PMOS transistor.

[0009] As a further technical solution of the utility model: After the charger is inserted into the BMS, interface cnct and interface cnct1 are connected, charging interface B+1 and charging interface B are connected, and charging interface C-1 and charging interface C are connected.

[0010] As a further technical solution of the present utility model: the resistors R1, R3, and R6 form a voltage dividing circuit.

[0011] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0012] The present utility model adds a circuit for mutual recognition between the lithium battery BMS and the charger, reducing the possibility of battery damage and fire caused by inserting an incompatible charger. Description of the Drawings

[0013] Figure 1 is the circuit diagram of the present utility model. Specific Embodiments

[0014] The technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0015] Referring to Figure 1 , a mutual recognition detection circuit between a lithium battery BMS and a charger includes a charger, resistors R1, R2, R3, R4, R5, R6, R7, MOS transistors M1 and M2. One end of the resistor R1 is connected to the resistors R2 and R3, the other end of the resistor R1 is connected to the charging interface B+, the other end of the resistor R2 is connected to the resistor R7 and the interface cnct, the other end of the resistor R3 is connected to the drain of the MOS transistor M1, the source of the MOS transistor M1 is connected to the resistors R4 and R6, the other end of the resistor R6 is connected to the drain of the MOS transistor M2 and the charging interface B-, the source of the MOS transistor M2 is connected to the resistor R7 and the interface C-, the charger is respectively connected to the charging interface B+1, the resistor R5 and the interface C-1, the gates of the MOS transistors M1 and M2 are both connected to the MCU, and the other end of the resistor R4 is connected to the MCU.

[0016] The working principle is as follows:

[0017] When seeing an under-voltage alarm on the lithium battery, we need to insert a charger to charge the lithium battery. The following is a specific description: First, the charging ports (B+ and C-) of the lithium battery BMS and the output ports (B+1 and C-1) of the charger are both closed. After the charger is inserted into the BMS, the charger will first perform a detection, that is, output a level through the resistor R5, pass through cnct1, cnct1 resistor R7, c-, c-1 and return to the charger to form a loop. At this time, when the charger detects that the correct battery has been inserted, it will open the output ports, so that there is a voltage at the output ports B+1 and C-1, which also means that there will be a voltage at the charging ports (B+, C-) of the lithium battery BMS, and a loop is formed through the resistors R1, R2, R7. Since the MCU itself has detected a partial voltage V_CHARER using the battery terminal B+, R1, R3, M1, R6, B_. When B+ and C- are also conducted, the voltage drop across the resistor R1 will change, and then V_CHARER will change to calculate the input voltage of the charger. When the requirements are met, the MCU controls M2 to open for charging.

[0018] By this method, the problems of battery damage and even fire caused by charger incompatibility can be completely solved.

[0019] The present invention provides a charging control scheme for a low-power self-wake-up single-coil transmitter compatible with various different types of wireless charging devices. There is no need for a complex multi-coil transmitter control circuit. By switching and controlling the single-coil resonant capacitor, charging for various different types of wireless charging receiving terminal devices such as "mobile phones, earphone charging cases, watches" can be achieved, reducing the limitations and production costs of the development and design of multi-functional wireless charging products. In the wireless charging mobile power supply, low-power self-wake-up is achieved through wireless charging Q value detection. Without mechanical buttons and touch buttons, the standby low-power automatic load identification and self-start function can be realized. It can be used as a wireless charging mobile power supply without buttons, and the low-power automatic load identification and self-start function bring a more intelligent user experience to the product.

[0020] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

[0021] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment have been appropriately combined to form other embodiments that are easily understood by those skilled in the art.

Claims

1. A mutual recognition detection circuit for a lithium battery BMS and a charger, comprising a charger, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, MOS transistor M1 and MOS transistor M2, characterized in that: One end of the resistor R1 is connected to the resistor R2 and the resistor R3, the other end of the resistor R1 is connected to the charging interface B+, the other end of the resistor R2 is connected to the resistor R7 and the interface cnct, the other end of the resistor R3 is connected to the drain of the MOS transistor M1, the source of the MOS transistor M1 is connected to the resistor R4 and the resistor R6, the other end of the resistor R6 is connected to the drain of the MOS transistor M2 and the charging interface B-, the source of the MOS transistor M2 is connected to the resistor R7 and the interface C-, the charger is respectively connected to the charging interface B+1, the resistor R5 and the interface C-1, the gates of the MOS transistor M1 and the MOS transistor M2 are both connected to the MCU, and the other end of the resistor R4 is connected to the MCU.

2. The mutual recognition detection circuit for a lithium battery BMS and a charger according to claim 1, wherein The MOS transistor M1 is a PMOS transistor.

3. The mutual recognition detection circuit between a lithium battery BMS and a charger according to claim 1, characterized in that, The MOS transistor M2 is a PMOS transistor.

4. A mutual recognition detection circuit for a lithium battery BMS and a charger according to claim 1, wherein, After the charger is inserted into the BMS, the interface cnct and the interface cnct1 are connected, the charging interface B+1 and the charging interface B are connected, and the charging interface C-1 and the charging interface C are connected.

5. The mutual recognition detection circuit for a lithium battery BMS and a charger according to claim 4, characterized in that, The resistors R1, R3, and R6 form a voltage dividing circuit.

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